Good e-day, People Of Earth!

Here's today's missive....I've a UNIX box collecting transactions, using
ODBC/32 to talk to my 3000.  Is there a way that a UNIX transaction can
trigger an action (e.g. stream a job) on my e-3?

Al Karman
Senior Operations Analyst
Administrative Management Group
847.870.9288
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        -----Original Message-----
        From:   Chris Goodey [SMTP:[log in to unmask]]
        Sent:   Friday, March 31, 2000 12:39 PM
        To:     [log in to unmask]
        Subject:        Re: compression vs no compression, was New DDS-3
drive, speed vs D DS-1

        Now that we know a DDS-3 drive is maybe 5 times faster than a
DDS-1 drive
        when used WITHOUT compression, the next question is:  Why not
use
        compression?

        A recent TurboStore timing I did storing to a DDS-2 drive, with
hardware
        compression,
        reported about 1.4 megabytes a second actual through-put (those
data bases
        compress well,
        especially since they are seldom filled to capacity.)

        Now I suppose if you have a very fast cpu it might be able to
compress
        better
        than the tape drive, in which case you would want to turn off
hardware
        compression.

        But in general, are we not better off just leaving compression
on in
        hardware?
        (yes, if writing a DDS-1 tape it would be better for
compatibility with old
        drives
        not to compress, but this is a special case.)

        Has any done any testing of hardware versus software compression
with
        TurboStore and Orbit
        backup? My guess was that at the highest compression level, the
software
        might be better,
        but it is enough better to worry about?


        > -----Original Message-----
        > From: Bruce Toback [mailto:[log in to unmask]]
        > Sent: Friday, March 31, 2000 10:01 AM
        > To: [log in to unmask]
        > Subject: Re: New DDS-3 drive
        >
        >
        > Art Frank asks:
        >
        > >2.  How much faster (roughly) is [DDS-3] than the C1503 DDS-1
drive
        > >that it is replacing?  Hardware compression is off.
        >
        > DDS-1 native transfer rate to tape is 173 KB/s. DDS-3 native
transfer
        > rate to tape (using DDS-3 media) is 1 MB/s. The channel may be
slower
        > than that.
        >
        > -- Bruce
        >
        > --------------------------------------------------------------